Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Receivable

Summary of trade accounts receivable

The following is a summary of trade accounts receivable at December 31, (in millions):

	2012			2011
Gross accounts receivable	$	297.2		$	288.4
Allowance for doubtful accounts		(7.9	)		(5.6	)
Accounts receivable, net	$	289.3		$	282.8

Summary of activity in the allowance for doubtful accounts

The following is a summary of the activity in the Company's allowance for doubtful accounts at December 31, (in millions):

	Balance at Beginning of Period		Additions Charged to Expense		Deductions Amounts Written Off			Balance at End of Period
2012	$	5.6	$	3.0	$	(0.7	)	$	7.9
2011		5.1		0.9		(0.4	)		5.6
2010		5.4		0.3		(0.6	)		5.1